Hydraulic jack



Aug. 29, 1944. V C STUTTER v 2,356,899

HYDRAULIC JACK Filed Dec. 24, 1942 INVENTOR I ATTORNEY central opening extending therethrough.

Patented Aug. 29,1944

UNITED STATES PATENT OFFICE HYDRAULIQJACK (Hinton stutter, Maspeth, N. Y, Application December 24, 1942, Serial No. 470,051

' (on. sea-1) v v The ram member, in the preferred form, corn- 2 Claims.

My invention relates to a hydraulic jack and more particularly to a readily portable jack,

which may be employed, among other things, for

pulling radius rod pins in motor vehicles.

Heretofore, it has been an exceedingly diflicult undertaking to remove a radius rod pin, particularly when the pin has become greatly worn or distorted, or has become rusted or corroded in place. It has usually been necessary to work in an exceedingly cramped space and drive the pin out with-a hammer and some form of drift. B y

nice-us of my improved hydraulic jack, aradl'us or will become apparent to those skilled in the' art.

In the drawing which shows, for illustrative purposes only, a preferred form of the inventionl is a-central, sectional view through an hydraulic jack, illustrating features of the inventi-en;

the jack in its operative environment.

Briefly stated, the jack includes a cylinder member having a central opening therethrough and a concentric annularcylinder or cylinder space. A ram member has an annular piston fit ting in the cylinder space and a hydraulic connecis made to the cylinder space behind the ram 2 is a view similar to Fig. l but illustrating The central opening through the cylinder member is adapted to receive a draw rod or tennieniher which is engageable with the ram sha er id the pin to be pulled while the cylthe pin is fitted. 1 the specific form illustrated, the cylinder is made up of an on r cylindrical member and inner cylindrical or sleeve member 5 having a The two cylindrical members 5 and t are spaced apart sons to define an annular cylinder space or jackcyllnder t. In the form shown, the outer sleeve has an inturned lateral flange 27 which 'interfits an outwardly directed lateral flange it on the inner sleeve. The two flanges may be suitably packed, as indicated at ii, and may be secured together by any suitable means such as screws or'by welding (not shown).

member is bottomed on, say, the member on prises a tubular or.sleevellke member 12 carrying an annular piston at its inner end. The piston includes unsuitable annular C-ring type of cup packing l3,held to the lower end of the ram member l2 as by means of cap screws l, as will be understood. V

An hydraulic connection [5 is made to the annular cylinder 8 in the space behind the ram piston and any suitable source of hydraulic pressure, such as a hand hydraulic pump, may be attached at the connection point iii.

When the ram member 52 is in the form of a sleeve, as illustrated, it is desirable to guide and dust seal the forward end of the cylinder. In the form shown, an annular guiding and dust cap l6 may be screwed ontothe outer sleeve member 5 and an annular grinding and dust cap ll may be screwed onto the outer end of the inner sleeve 6.

The dust caps may carry suitable packings ll to embrace the inner andouter sides of the sleeve M of the rain and thus exclude dust and preferably also prevent serious leakage or any hydraulic fluid which may leak into the cylinder 8 forwardly 01 the piston. The dust caps serve also as guides for the ram sleeve as it moves back and forth in the cylinder, as will be understood. The forward end of the ram sleeve 52 may carry an abutment head it which may be removably secured thereto, or may simply rest ,on the end of the sleeve iii.

in Fig. 12 I have illustrated my improved iaclr as embodied in a pin puller for pulling a pivot pin securing a radius rod to a radius rod bracket of a motor vehicle. As illustrated, the radius rod bracket 2% has a tongue interfitting with the yoke on the radius rod 22 i. The radius rod pin 22 passes through openings in both the radius rod and radius rod bracket and is secured in the rod yoke as by means of cross pins or the like. The pin 22 may be provided with a screw threaded opening which normally receives a lubrication fitting employed in lubricating the bearing surfaces between the bracket bushing and pin. y

when the pin 22 is to be pulled by means of my improved jack, the cylinder member may be abutted against the bracket or the radius rod, or both. A tension or draw rod fit passing through the opening i in the cylinder member is engaged with the pin 22 as by means of an adapter interposed between the draw rod and the pin 22, or by providing the draw rod 24 with a screw threaded projection to screw into the opening 23 in the pinfi. The draw rod 24 is engageable with the ram l2 as by having an adjustable nut 25 on the ram piston, the ram is projected, and through the draw rod the pin 22 is drawn out of the bores in the radius rod bracket and the radius rod. In some cases, particularly where the pin 22 is too large, to pass through the central opening 7 in the jack cylinder, a longer draw rod 24- may be employed and a sleeve interposed between the base of the jack cylinder and the radius rod bracket and radius rod so that the pin 22 may be pulled through the sleeve and disengaged before it reaches the bore I in the cylinder. Where pins such as 22 have various types of threaded con-.

nections such as 23, it may be advisable to use a single drawrcd 24 and employ anadapter I which may be secured to the draw rod and interfit with the threaded connection to the pin. Various adapters would be used for different pin connections, as will be understood.

In order to limit the travel. of the ram and prevent itfrom forcing the packings out of the cylinder, I may provide a relief port 26' which would be uncovered when the ram has been projected to its limit. The port may normally be closed by aspring pressed valve 21.

It will be seen that by means of my invention pins may be readily drawn and it is only necessary to have suillcient room to receive the jack and it is unnecessary to have room enough to swing a hammer. Thus, by means of my inventicn, pins may be drawn which are in exceedingly inaccessible locations. Furthermore, my improved jack, while designed primarily for pulling radius rod pins, may be employed for.other purposes and may beused either as a pull or push type jack.

While the invention has been described in considerable detail and a preferred form illustrated. it is to be understood that various changes may be made within the scope of the invention as defined in the appended claims.

I claim: 1. In a device of the character indicated, a

pair of concentric cylindrical members defining an annular cylinder space between them, one of ing substantially completely across said annular cylinder space and forming the bottom of a ram cylinder, an annular ram member in said ram cylinder, hydraulic pressure connection means to said cylinder beneath said ram member, the inner of said pair of cylindrical members having an axially extending bore therein to permit passage of a draw rod.

2. In a device of the character indicated, a pair of concentric cylindrical members closed at their base ends and defining an annular cylinder space, a ram in said cylinder, said ram comprising a cylindrical sleeve having an enlarged annular piston head atthe inner end thereof fitting said cylinder, packing and guide means for saidram sleeve comprising an annular guide member removably secured in the outer of said concentric cylindrical members and an annular guide member removably secured to and about the inner of said cylindrical members, said guide members being spaced apart annularly to receive said ram sleeve, and a removable head on said ram sleeve and positioned exteriorly of said packing and guide means.

- CLINTON S'I'U'I'I'ER. 

